/*
 * Copyright (2022) Bytedance Ltd. and/or its affiliates
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include <Parsers/ASTFunction.h>
#include <Interpreters/Context_fwd.h>

namespace DB
{

enum class FunctionType
{
    UNKNOWN,
    FUNCTION,
    AGGREGATE_FUNCTION,
    WINDOW_FUNCTION,
    GROUPING_OPERATION,
    LAMBDA_EXPRESSION,
    EXISTS_SUBQUERY,
    IN_SUBQUERY,
};

FunctionType getFunctionType(const ASTFunction & function, ContextPtr context);

ASTs getLambdaExpressionArguments(ASTFunction & lambda);
ASTPtr getLambdaExpressionBody(ASTFunction & lambda);

bool isComparisonFunction(const ASTFunction & function);
bool functionIsInSubquery(const ASTFunction & function);
// exists, not exists
bool functionIsExistsSubquery(const ASTFunction & function);

}
